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The answer isn't that simple. My 98 dodge will almost never go into DFCO without downshifting or going really really fast , my Impala and pervious Malibu won't go into DFCO without downshifting out of OD, they unlock the torque convertor and coast almost as good in OD as N(haven't driven 2010 cobalt to know how it works). Want engine braking need to shift to D.
If Neutral coasting extends you coast distance considerably it's most often better than using DFCO unless going downhill where you need to limit top speed or stop at the bottom.
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